linux-kernel - Re: [syzbot] UBSAN: shift-out-of-bounds in jfs

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Message-ID: <0000000000003a702c05edcf81ef@google.com>
Date:   Sat, 19 Nov 2022 01:32:45 -0800
From:   syzbot <syzbot+3424c9550a49659f1704@...kaller.appspotmail.com>
To:     jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] UBSAN: shift-out-of-bounds in jfs_statfs

syzbot has found a reproducer for the following issue on:

HEAD commit:    ab290eaddc4c Merge tag 's390-6.1-5' of git://git.kernel.or..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1006e331880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6f9416d398342c83
dashboard link: https://syzkaller.appspot.com/bug?extid=3424c9550a49659f1704
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15a0ec6e880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105d8d45880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a3af44347ffd/disk-ab290ead.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4331229e5ff9/vmlinux-ab290ead.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b0c12f02efc3/bzImage-ab290ead.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6e5bfebe2bc7/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3424c9550a49659f1704@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/super.c:140:14
shift exponent 1749508610 is too large for 64-bit type 's64' (aka 'long long')
CPU: 0 PID: 3634 Comm: syz-executor222 Not tainted 6.1.0-rc5-syzkaller-00241-gab290eaddc4c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 jfs_statfs+0x503/0x510 fs/jfs/super.c:140
 statfs_by_dentry fs/statfs.c:66 [inline]
 vfs_statfs+0x136/0x310 fs/statfs.c:90
 user_statfs fs/statfs.c:105 [inline]
 __do_sys_statfs fs/statfs.c:195 [inline]
 __se_sys_statfs fs/statfs.c:192 [inline]
 __x64_sys_statfs+0x120/0x230 fs/statfs.c:192
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0501ab8f79
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffffd945308 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f0501ab8f79
RDX: 00007f0501a77473 RSI: 0000000000000000 RDI: 0000000020004c80
RBP: 00007f0501a78740 R08: 0000555555fe32c0 R09: 0000000000000000
R10: 00007ffffd9451d0 R11: 0000000000000246 R12: 0a0a0a0a0a0a0a0a
R13: 0000000000000000 R14: 00083878000000f8 R15: 0000000000000000
 </TASK>
================================================================================